Method of making a foamed article

A method combining EVA copolymers with thermoset polyurethane and a compatibilizer enhances EVA foam properties, addressing recycling and property enhancement challenges, resulting in improved resilience and reduced compression set.

US20260192497A1Pending Publication Date: 2026-07-09SAHARA INTERNATIONAL PETROCHEMICAL CO (SIPCHEM)
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SAHARA INTERNATIONAL PETROCHEMICAL CO (SIPCHEM)
Filing Date
2025-01-08
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

There is a need for effective methods to recycle thermoset polyurethane polymers and enhance the properties of ethylene vinyl acetate (EVA) copolymers, particularly in terms of resilience, mechanical toughness, and compression set, as well as a method to incorporate waste thermoset polyurethane into EVA foam applications.

Method used

A method involving the mixing of a first EVA copolymer with thermoset polyurethane, a second EVA copolymer, a compatibilizer, and a foaming agent to form a composite, which is then processed to create a foamed article with improved properties, including reduced compression set and increased resilience.

Benefits of technology

The resulting foamed article exhibits enhanced properties such as reduced compression set and increased resilience compared to articles made without thermoset polyurethane, effectively recycling waste thermoset polyurethane and improving EVA foam performance.

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Patent Text Reader

Abstract

A method of making a foamed article including mixing a first ethylene vinyl acetate (EVA) copolymer and a thermoset polyurethane to form a composite, mixing the composite, a second EVA copolymer, a compatibilizer, and a foaming agent to form a mixture and forming the foamed article from the mixture. A compression set of the foamed article is 0-100% lower than a compression set of a foamed article made by the same method but without the thermoset polyurethane polymer.
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